In telecommunications, average bitrate (ABR) refers to the average amount of data transferred per unit of time, usually measured per second, commonly for digital music or video. An MP3 file, for example, that has an average bit rate of 128 kbit/s transfers, on average, 128,000 bits every second. It can have higher bitrate and lower bitrate parts, and the average bitrate for a certain timeframe is obtained by dividing the number of bits used during the timeframe by the number of seconds in the timeframe. Bitrate is not reliable as a standalone measure of audio or video quality, since more efficient compression methods use lower bitrates to encode material at a similar quality.
Average bitrate can also refer to a form of variable bitrate (VBR) encoding in which the encoder will try to reach a target average bitrate or file size while allowing the bitrate to vary between different parts of the audio or video. As it is a form of variable bitrate, this allows more complex portions of the material to use more bits and less complex areas to use fewer bits. However, bitrate will not vary as much as in variable bitrate encoding.[1] At a given bitrate, VBR is usually higher quality than ABR, which is higher quality than CBR (constant bitrate).[2] ABR encoding is desirable for users who want the general benefits of VBR encoding (an optimum bitrate from frame to frame) but with a relatively predictable file size.[1] Two-pass encoding is usually needed for accurate ABR encoding, as on the first pass the encoder has no way of knowing what parts of the audio or video need the highest bitrates to be encoded.[3]
average, bitrate, telecommunications, average, bitrate, refers, average, amount, data, transferred, unit, time, usually, measured, second, commonly, digital, music, video, file, example, that, average, rate, kbit, transfers, average, bits, every, second, have,. In telecommunications average bitrate ABR refers to the average amount of data transferred per unit of time usually measured per second commonly for digital music or video An MP3 file for example that has an average bit rate of 128 kbit s transfers on average 128 000 bits every second It can have higher bitrate and lower bitrate parts and the average bitrate for a certain timeframe is obtained by dividing the number of bits used during the timeframe by the number of seconds in the timeframe Bitrate is not reliable as a standalone measure of audio or video quality since more efficient compression methods use lower bitrates to encode material at a similar quality Average bitrate can also refer to a form of variable bitrate VBR encoding in which the encoder will try to reach a target average bitrate or file size while allowing the bitrate to vary between different parts of the audio or video As it is a form of variable bitrate this allows more complex portions of the material to use more bits and less complex areas to use fewer bits However bitrate will not vary as much as in variable bitrate encoding 1 At a given bitrate VBR is usually higher quality than ABR which is higher quality than CBR constant bitrate 2 ABR encoding is desirable for users who want the general benefits of VBR encoding an optimum bitrate from frame to frame but with a relatively predictable file size 1 Two pass encoding is usually needed for accurate ABR encoding as on the first pass the encoder has no way of knowing what parts of the audio or video need the highest bitrates to be encoded 3 See also EditVariable bitrate Constant bitrateReferences Edit a b Average Bitrate Knowledgebase wiki Hydrogenaudio 2007 retrieved 2009 10 01 LAME Knowledgebase wiki Hydrogenaudio 2009 retrieved 2009 10 04 Rate Control Encoding Mode H 264 AVC options explained wiki documentation Avidemux 2009 retrieved 2009 09 30External links Edit Average Bitrate in LAME encoder Knowledgebase wiki Hydrogenaudio An explanation sort of of ABR GPSYCHO Average Bit Rate ABR Lame Sourceforge nbsp This computer networking article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Average bitrate amp oldid 1106833922, wikipedia, wiki, book, books, library,
